Low-voltage direct-current hybrid circuit breaker with adaptive adjustment function and control method

Abstract

The application provides a low-voltage direct-current hybrid circuit breaker with an adaptive adjustment function, which comprises a first access end, a second access end, an energy consumption branch, a main through-flow branch and a commutation branch. The commutation branch comprises a field effect transistor module and at least four diodes. The field effect transistor module comprises m field effect transistors. By arranging the field effect transistor module comprising m field effect transistors, different numbers of field effect transistors can be turned on to shunt according to different amplitudes of fault currents, so that different current ranges can be adapted, and the adaptive capacity is strong. Moreover, by turning on different numbers of field effect transistors, a large current can be shunted, so that the value of the fault current borne by a single device is reduced, and a plurality of low-rated current field effect transistors can be used to break a larger fault current.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a low-voltage DC hybrid circuit breaker with adaptive adjustment function and a control method thereof. Background Technology

[0002] The nation has proposed a strategic development plan of "peak carbon and carbon neutrality," placing higher demands on energy conservation and emission reduction. Against this backdrop, new energy technologies have attracted increasing attention, with photovoltaic power generation, wind power, electric vehicles, information centers, zero-carbon buildings, and energy storage technologies experiencing significant development. Compared to traditional AC transmission and distribution systems, the new DC-based power system offers advantages such as ease of control, flexible load switching, and simple structure. Furthermore, an increasing number of loads are trending towards DC, with typical loads including DC refrigerators, air conditioners, and laptops. Unlike AC protection, DC systems lack a natural zero-crossing point, making it difficult to extinguish fault arcs. Additionally, due to lower system impedance and multiple source connections, the fault-causing current rises rapidly, thus placing more stringent requirements on DC interruption. Summary of the Invention

[0003] Therefore, it is necessary to propose a low-cost, simple-structured low-voltage DC hybrid circuit breaker with adaptive adjustment function to address the above problems.

[0004] In one aspect, a low-voltage DC hybrid circuit breaker with adaptive adjustment function is provided, comprising: a first access terminal, a second access terminal, an energy-consuming branch, a main current-carrying branch, and a converter branch;

[0005] The first end of the energy-consuming branch is connected to the first access end, and the second end of the energy-consuming branch is connected to the second access end; the first access end is the incoming line of the low-voltage DC hybrid circuit breaker, and the second access end is the outgoing line of the low-voltage DC hybrid circuit breaker.

[0006] The first end of the main flow branch is connected to the first access end, the second end of the main flow branch is connected to the second access end, and the energy-consuming branch is connected in parallel with the main flow branch;

[0007] The first end of the converter branch is connected to the first access end, the second end of the converter branch is connected to the second access end, and the converter branch is connected in parallel with the energy-consuming branch and the main current-carrying branch;

[0008] The commutation branch includes a field-effect transistor module and at least four diodes;

[0009] The field-effect transistor module includes m field-effect transistors. The first terminal of the field-effect transistor module is connected to the drain of each field-effect transistor, the second terminal of the field-effect transistor module is connected to the source of each field-effect transistor, and the third terminal of the field-effect transistor module is connected to the gate of each field-effect transistor.

[0010] The first access terminal is connected to the anode of the first diode and the cathode of the third diode. The cathode of the first diode is connected to the first terminal of the field-effect transistor module and the cathode of the second diode. The anode of the third diode is connected to the second terminal of the field-effect transistor module and the anode of the fourth diode. The second access terminal is connected to the anode of the second diode and the cathode of the fourth diode. When the low-voltage DC hybrid circuit breaker fails, the main current-carrying branch is disconnected, and n field-effect transistors in the field-effect transistor module conduct to transfer the fault current. When the n field-effect transistors are disconnected, the energy-consuming branch conducts to clear the fault current. Wherein, n and m are both integers greater than or equal to 1, and n ≤ m.

[0011] In conjunction with the first aspect, in one possible implementation, the field-effect transistors in the field-effect transistor module are silicon carbide field-effect silicon transistors.

[0012] In conjunction with the first aspect, in one possible implementation, the main current-carrying branch includes a mechanical circuit breaker, a first end of which is connected to the first access terminal, and a second end of which is connected to the second access terminal; the mechanical circuit breaker is used to disconnect the main current-carrying branch when the low-voltage DC hybrid circuit breaker fails.

[0013] In conjunction with the first aspect, in one possible implementation, the energy-consuming branch includes a varistor, a first end of which is connected to the first access terminal, and a second end of which is connected to the second access terminal; the varistor is used to clear the fault current when the low-voltage DC hybrid circuit breaker fails.

[0014] In conjunction with the first aspect, in one possible implementation, the low-voltage DC hybrid circuit breaker further includes a drive module, a first end of which is connected to the first access terminal, a second end of which is connected to the second access terminal, and a third end of which is connected to the third end of the field-effect transistor module. The drive module is used to drive the field-effect transistors in the field-effect transistor module to conduct when the low-voltage DC hybrid circuit breaker fails.

[0015] In conjunction with the first aspect, in one possible implementation, the low-voltage DC hybrid circuit breaker further includes a detection module, a first end of which is connected to the first access terminal, and a second end of which is connected to the drive module. The detection module is used to detect the magnitude of the fault current.

[0016] In conjunction with the first aspect, in one possible implementation, the low-voltage DC hybrid circuit breaker further includes a power supply module, a first terminal of which is connected to a second terminal of the drive module, a second terminal of which is connected to a second access terminal, and a third terminal of which is connected to a third terminal of the detection module. The power supply module is used to supply power to the drive module and the detection module.

[0017] In a second aspect, a control method for a low-voltage DC hybrid circuit breaker with adaptive adjustment function is provided, applied to the low-voltage DC hybrid circuit breaker described in any one of the first aspects, the method comprising:

[0018] When the low-voltage DC hybrid circuit breaker fails, the magnitude of the fault current is obtained;

[0019] The number of field-effect transistors turned on in the field-effect transistor module is determined based on the magnitude of the fault current, and the corresponding number of field-effect transistors in the field-effect transistor module are controlled to be turned on.

[0020] Thirdly, a computer device is provided, including a memory and one or more processors, the one or more processors being configured to execute one or more computer programs stored in the memory, wherein when the one or more processors execute the one or more computer programs, the computer device performs the low-voltage DC hybrid circuit breaker control method with adaptive adjustment function described in the second aspect above.

[0021] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, cause the processor to perform the low-voltage DC hybrid circuit breaker control method with adaptive adjustment function described in the second aspect above.

[0022] This application achieves the following beneficial effects: By setting a field-effect transistor (FET) module including m FETs, it can conduct different numbers of FETs to shunt current according to different magnitudes of fault current, thereby adapting to different current ranges and exhibiting strong adaptive capability. Furthermore, by conducting different numbers of FETs, larger currents can be shunt, thereby reducing the fault current value borne by a single device. This allows for the interruption of larger fault currents using multiple low-rated current FETs, thus reducing device cost. In addition, by setting at least four diodes connected in anti-series pairs, this application can achieve bidirectional current protection in the event of a fault, reducing the number of FETs used, simplifying the circuit structure, and further reducing device cost. Attached Figure Description

[0023] Figure 1 A schematic diagram of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0024] Figure 2 This is a schematic diagram of the structure of a detection module provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of the breaking current waveform segmentation of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0026] Figure 4 A schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0027] Figure 5 A schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0028] Figure 6 A schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0029] Figure 7 A schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function provided in this application embodiment;

[0030] Figure 8 A flowchart illustrating a low-voltage DC hybrid circuit breaker control method with adaptive adjustment function provided in this application embodiment;

[0031] Figure 9 This is an internal structural diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0033] The technical solution proposed in this application can be applied to new power systems that are mainly based on DC. Specifically, it is used to interrupt DC in the event of a fault in a DC scenario, so as to clear the fault current in the system and protect the power system.

[0034] In one embodiment, this application proposes a low-voltage DC hybrid circuit breaker with adaptive adjustment function. For example... Figure 1 As shown, Figure 1 This is a schematic diagram of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. It includes: a first access terminal 10, a second access terminal 20, an energy-dissipating branch 30, a main current-carrying branch 40, and a converter branch 50. The first end of the energy-dissipating branch 30 is connected to the first access terminal 10, and the second end of the energy-dissipating branch 30 is connected to the second access terminal 20. The first access terminal 10 is the incoming line of the low-voltage DC hybrid circuit breaker, and the second access terminal 20 is the outgoing line of the low-voltage DC hybrid circuit breaker. The first end of the main current-carrying branch 40 is connected to the first access terminal 10, and the second end of the main current-carrying branch 40 is connected to the second access terminal 20. The energy-dissipating branch 30 is connected in parallel with the main current-carrying branch 40. The first end of the converter branch 50 is connected to the first access terminal 10, and the second end of the converter branch 50 is connected to the second access terminal 20. The converter branch 50 is connected in parallel with the energy-dissipating branch 30 and the main current-carrying branch 40.

[0035] Under normal operating conditions, the main current-carrying branch 40 is conducting, and the current flows from the first access terminal 10 through the main current-carrying branch 40 to the second access terminal 20. The energy-consuming branch 30 and the converter branch 50 are not conducting.

[0036] The commutation branch 50 includes a field-effect transistor module 501 and at least four diodes.

[0037] The field-effect transistor module 501 includes m field-effect transistors. The first terminal of the module 501 is connected to the drain of each field-effect transistor, the second terminal is connected to the source of each field-effect transistor, and the third terminal is connected to the gate of each field-effect transistor. The first access terminal 10 is connected to the anode of the first diode D1 and the cathode of the third diode D3. The cathode of the first diode D1 is connected to the first terminal of the field-effect transistor module 501 and the cathode of the second diode D2. The anode of the third diode D3 is connected to the second terminal of the field-effect transistor module 501 and the anode of the fourth diode D4. The second access terminal 20 is connected to the anode of the second diode D2 and the cathode of the fourth diode D4. When the low-voltage DC hybrid circuit breaker fails, the main current-carrying branch 40 is disconnected, and the n field-effect transistors in the module conduct to transfer the fault current. When the n field-effect transistors are disconnected, the energy-dissipating branch 30 conducts to clear the fault current. Wherein, n and m are both integers greater than or equal to 1, and n ≤ m.

[0038] In one embodiment, the field-effect transistors in the field-effect transistor module 501 are silicon carbide field-effect transistors. By using silicon carbide field-effect transistors, the service life of the low-voltage DC hybrid circuit breaker is significantly increased, reaching millions of cycles, while also making the circuit breaker's opening and closing faster and more accurate.

[0039] In one embodiment, the main current-carrying branch 40 includes a mechanical circuit breaker, the first end of which is connected to the first access terminal 10, and the second end of which is connected to the second access terminal 20; the mechanical circuit breaker is used to disconnect the main current-carrying branch 40 when the low-voltage DC hybrid circuit breaker fails.

[0040] Specifically, the mechanical circuit breaker is a molded case circuit breaker. In practical applications, the circuit breaker in the main current-carrying branch 40 can also be a liquid-breaking, gas-breaking, or a series-parallel combination of liquid and gas-breaking contacts. The liquid in the liquid-breaking contact can be any liquid capable of breaking and insulating, such as distilled water, transformer oil, vegetable oil, liquid C5F10O, mineral oil, or silicone oil. By using a liquid-breaking contact, the circuit breaker has better breaking capacity and stronger insulation strength.

[0041] In one embodiment, the energy-consuming branch 30 includes a varistor, the first end of which is connected to the first access terminal 10, and the second end of which is connected to the second access terminal 20; the varistor is used to clear the fault current when the low-voltage DC hybrid circuit breaker fails.

[0042] Specifically, the varistor is a metal oxide varistor. Since the resistance of a metal oxide varistor decreases as voltage increases, a large voltage overshoot causes the power-consuming branch 30 to conduct, allowing fault current to flow through this branch. This keeps the voltage within a safe range and clears the fault current.

[0043] In one embodiment, the low-voltage DC hybrid circuit breaker further includes a drive module 60, a first end of which is connected to a first access terminal 10, a second end of which is connected to a second access terminal 20, and a third end of which is connected to a third end of a field-effect transistor module 501. The drive module 60 is used to drive the field-effect transistors in the field-effect transistor module 501 to conduct when a fault occurs in the low-voltage DC hybrid circuit breaker.

[0044] In one embodiment, the low-voltage DC hybrid circuit breaker further includes a detection module 70, with a first end connected to a first access terminal 10 and a second end connected to a drive module 60. The detection module 70 is used to detect the magnitude of the fault current.

[0045] The detection module 70 includes a sensor for detecting the magnitude of the current, specifically the current rise rate and the peak current. The current rise rate is related to the line time constant, while the peak current is related to the line resistance.

[0046] In one embodiment, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the detection module 70. The detection module 70 includes a sensor, a filter, an AD converter, a CPU, a driving MOSFET unit, a human-machine interface unit, and a communication unit. The sensor, filter, AD converter, and CPU are connected sequentially, and the driving MOSFET unit, the human-machine interface unit, and the communication unit are connected to the CPU. The sensor detects the rate of rise and peak value of the fault current and generates a corresponding current signal. The filter unit filters the current signal to reduce noise. The AD converter converts the current signal into a converted signal that the CPU can recognize. The CPU controls the driving MOSFET unit to generate a corresponding driving signal based on the converted signal and also controls the communication unit to send the converted signal to the user terminal. The CPU also interacts with the user through the human-machine interface unit, receiving device parameters and other information input by the user.

[0047] In one embodiment, the low-voltage DC hybrid circuit breaker further includes a power supply module 80, with a first end connected to a second end of a drive module 60, a second end connected to a second access terminal 20, and a third end connected to a third end of a detection module 70. The power supply module 80 is used to supply power to the drive module 60 and the detection module 70.

[0048] Specifically, under normal operating conditions, current flows through the first access terminal 10, the main current-carrying branch 40, and then to the second access terminal 20. When a fault occurs at the second access terminal 20, the current in the main current-carrying branch 40 increases rapidly, and the molded case circuit breaker contacts open under thermomagnetic action. At this time, an electric arc is generated between the contacts of the molded case circuit breaker, the voltage gradually rises, and the current rises more slowly under the influence of the voltage. The power supply circuit draws power from the bus side through the second access terminal 20 and stably outputs +30V and +5V voltages to power the drive module 60 and the detection module 70, respectively. The detection module 70 uses sensors to detect the fault current in the main current-carrying branch 40 in real time and compares it with the rated current of the silicon carbide field-effect transistors (SFETs). When the fault current is less than the sum of the rated currents of n (n≤m) SFETs but greater than the sum of the rated currents of n-1 SFETs, the detection module 70 transmits a drive signal to the drive module 60. When the drive module 60 receives the drive signal from the detection module 70, it generates a +30V drive voltage and simultaneously applies a voltage to the gates of the n SFETs, thereby controlling the n SFETs to conduct. Under the action of the arc voltage, the fault current is commutated to the commutation branch 50 composed of n SFETs connected in parallel, and the current passes sequentially through the first diode D1, the first SFET T1…T… n The second diode D2 transmits power to the second access terminal 20. After a certain delay, a -15V turn-off voltage is applied by the drive signal. The n silicon carbide field-effect transistors are turned off under the action of the drive signal. Due to the presence of line inductance, a large voltage drop is generated on both sides of the commutation branch 50, causing the metal oxide varistor to conduct. The fault current is diverted to the energy dissipation branch 30. The energy dissipation branch 30 stabilizes the voltage at a relatively stable value, and the current gradually becomes zero. The energy dissipation branch 30 is then turned off, and the fault current is cleared.

[0049] The following is through Figure 3 The schematic diagram of the segmented breaking current waveform of the low-voltage DC hybrid circuit breaker with adaptive adjustment function shown below explains the scheme of this application. Among them, Figure 3 U represents the voltage across the low-voltage DC hybrid circuit breaker, and I represents the voltage across the circuit breaker. MOV For the current of the varistor, I MOSFET For the rated current of silicon carbide field-effect transistors, I ARC This is the fault current.

[0050] Among them, before time t1, such as Figure 4 As shown, Figure 4 This is a schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. Figure 4 The darker area represents the circuit that is currently in operation. Under normal operating conditions, the current i1 flows through the first access terminal 10, the main current-carrying branch 40, and the second access terminal 20, and no system faults occur.

[0051] In the t1-t2 period, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. Figure 5 The darker areas represent the circuit components currently in operation. At time t1, the molded case circuit breaker S in the main current-carrying branch 40 opens its metal contacts under the influence of current thermomagnetism, generating a fault arc (fault current) i2 between the contacts. Since the current i1 flows along a constant path, the value of i1 is the same as that of the fault current i2. As the arc voltage between the contacts gradually increases, the rate of increase of the fault current i2 slows down under the limitation of the arc voltage. Simultaneously, the power supply module 80 draws power from the bus to supply power to the detection module 70. The detection module 70 monitors the current amplitude I and the rate of change of the fault current i2 in the main current-carrying branch 40 in real time, and determines whether the fault current i2 is rising or falling based on the rate of change. It also determines the number of silicon carbide field-effect transistors to be turned on by calculating the ratio of the current amplitude I of the fault current i2 to the rated current of the silicon carbide field-effect transistor.

[0052] At time t2, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. Figure 6 The darker area represents the circuitry in operation. Based on the drive signal sent by the detection module 70, the drive circuit activates n (n≤m) silicon carbide field-effect transistors (SFETs). Since the on-state voltage drop of SFETs is relatively small, and multiple devices connected in parallel do not increase the on-state voltage drop, the parallel connection of multiple devices further reduces the on-resistance of the low-voltage DC hybrid circuit breaker, which is more conducive to the commutation of the fault current i2. Under the influence of the arc voltage, the fault current i2 naturally commutates to the commutation branch 50. The n SFETs share the current amplitude I at the commutation moment, with each device sharing a current of I / n, which is less than the rated current specified for each SFET.

[0053] Among them, the t2-t3 time period, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. Figure 6The darker area represents the circuitry in operation. The commutation branch 50 is conducting, allowing current to flow through multiple silicon carbide field-effect transistors. Simultaneously, the contact gap continues to increase until it reaches its maximum value. The power supply circuit continues to draw power from the busbar, simultaneously supplying power to the drive module 60 and the detection module 70, ensuring the overall reliable operation of the system.

[0054] At time t3, such as Figure 7 As shown, Figure 7 This is a schematic diagram of the working circuit of a low-voltage DC hybrid circuit breaker with adaptive adjustment function. Figure 7 The darker area represents the circuit that is currently in operation. After a certain time delay, at time t3, the detection module 70 applies a signal to the drive circuit, thereby controlling the output voltage of the drive circuit to drop to the amplitude, driving the silicon carbide field-effect transistor to turn off stably. Due to the excessively fast turn-off speed of the silicon carbide field-effect transistor, a large overvoltage is induced under the influence of stray inductance in the circuit and applied across the metal oxide varistor. This voltage is greater than the clamping voltage of the metal oxide varistor, causing the energy-consuming branch 30 to conduct, and the fault current i2 to be switched to this branch.

[0055] During the time intervals t3-t4, the energy stored in the line inductance is dissipated through the metal oxide varistor. At the same time, the metal oxide varistor clamps the voltage at a stable value, which is approximately 1.5 to 1.8 times the system voltage, and does not exceed the rated voltage of the electronic devices.

[0056] At time t4, the fault current is completely cleared, and the voltage across the metal oxide varistor drops to the power supply voltage and remains thereafter.

[0057] This application, by setting up a field-effect transistor module 501 including m field-effect transistors, can conduct different numbers of field-effect transistors to shunt current according to different magnitudes of fault current, thereby adapting to different current ranges and exhibiting strong adaptive capability. Furthermore, by conducting different numbers of field-effect transistors, larger currents can be shunt, thereby reducing the fault current value borne by a single device. This allows for the interruption of larger fault currents using multiple low-rated current field-effect transistors, thus reducing device cost. In addition, by setting at least four diodes connected in anti-series pairs, this application can achieve bidirectional current protection in the event of a fault, reducing the number of field-effect transistors used, simplifying the circuit structure, and further reducing device cost.

[0058] In one embodiment, this application proposes a control method for a low-voltage DC hybrid circuit breaker with adaptive adjustment function, such as... Figure 8 As shown, Figure 8 A flowchart of a control method for a low-voltage DC hybrid circuit breaker with adaptive adjustment function, the method comprising:

[0059] Step 801: When the low-voltage DC hybrid circuit breaker fails, obtain the magnitude of the fault current.

[0060] When the low-voltage DC hybrid circuit breaker fails, the power supply module 80 draws power from the bus to supply power to the detection module 70. The detection module 70 detects the current amplitude I and the rate of change of the fault current i2 in the main current-carrying branch 40 in real time, and determines whether the fault current i2 is rising or falling by the rate of change. It also determines the number of silicon carbide field-effect transistors to be turned on by calculating the ratio of the current amplitude I of the fault current i2 to the rated current of the silicon carbide field-effect transistor.

[0061] Step 802: Determine the number of field-effect transistors turned on in the field-effect transistor module 501 according to the magnitude of the fault current, and control the corresponding number of field-effect transistors in the field-effect transistor module 501 to be turned on.

[0062] The detection module 70 uses sensors to detect the current amplitude I of the fault current in the main current-carrying branch 40 in real time and compares it with the rated current of the silicon carbide field-effect transistors. When the current amplitude I of the fault current is less than the sum of the rated currents of n (≤ m) silicon carbide field-effect transistors and greater than the sum of the rated currents of n-1 silicon carbide field-effect transistors, the detection module 70 transmits the drive signal to the drive module 60. The n silicon carbide field-effect transistors share the current amplitude I at the commutation moment, and the current shared by each device is I / n, which is less than the rated current specified by each silicon carbide field-effect transistor.

[0063] This application can conduct different numbers of field-effect transistors to shunt current according to different fault current amplitudes, thereby adapting to different current ranges and having strong adaptive capability; and by conducting different numbers of field-effect transistors, larger currents can be shunt, thereby reducing the fault current value borne by a single device, so that a larger fault current can be interrupted by using multiple low-rated current field-effect transistors, thereby reducing device cost.

[0064] like Figure 9 As shown, Figure 9 This is a diagram illustrating the internal structure of a computer device in one embodiment. The computer device may be a low-voltage DC hybrid circuit breaker with adaptive adjustment capabilities, or a terminal or server connected to a low-voltage DC hybrid circuit breaker with adaptive adjustment capabilities. Figure 9As shown, the computer device includes a processor, memory, and network interface connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement a low-voltage DC hybrid circuit breaker control method with adaptive adjustment capabilities. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to implement a low-voltage DC hybrid circuit breaker control method with adaptive adjustment capabilities. The network interface is used for communication with external devices. Those skilled in the art will understand that… Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0065] In one embodiment, the low-voltage DC hybrid circuit breaker control method with adaptive adjustment function provided in this application can be implemented as a computer program, which can be implemented as follows: Figure 9 The computer device shown is running the program. The computer device's memory can store the various program templates that make up the low-voltage DC hybrid circuit breaker with adaptive adjustment function.

[0066] A computer device includes a memory and a processor. The memory stores a computer program that, when executed by the processor, causes the processor to perform the following steps: when a low-voltage DC hybrid circuit breaker fails, acquiring the magnitude of the fault current; determining the number of field-effect transistors turned on in the field-effect transistor module 501 based on the magnitude of the fault current, and controlling the turning on of the corresponding number of field-effect transistors in the field-effect transistor module 501.

[0067] A computer device includes a memory and a processor. The memory stores a computer program that, when executed by the processor, causes the processor to perform the following steps: when a low-voltage DC hybrid circuit breaker fails, acquiring the magnitude of the fault current; determining the number of field-effect transistors turned on in the field-effect transistor module 501 based on the magnitude of the fault current, and controlling the turning on of the corresponding number of field-effect transistors in the field-effect transistor module 501.

[0068] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A low-voltage DC hybrid circuit breaker with adaptive adjustment function, characterized in that, include: First access terminal, second access terminal, energy-consuming branch, main current branch, converter branch; The first end of the energy-consuming branch is connected to the first access end, and the second end of the energy-consuming branch is connected to the second access end; the first access end is the incoming line of the low-voltage DC hybrid circuit breaker, and the second access end is the outgoing line of the low-voltage DC hybrid circuit breaker. The first end of the main flow branch is connected to the first access end, the second end of the main flow branch is connected to the second access end, and the energy-consuming branch is connected in parallel with the main flow branch; The first end of the converter branch is connected to the first access end, the second end of the converter branch is connected to the second access end, and the converter branch is connected in parallel with the energy-consuming branch and the main current-carrying branch; The commutation branch includes a field-effect transistor module and at least four diodes, including a first diode, a second diode, a third diode, and a fourth diode. The field-effect transistor module includes m field-effect transistors. The first terminal of the field-effect transistor module is connected to the drain of each field-effect transistor, the second terminal of the field-effect transistor module is connected to the source of each field-effect transistor, and the third terminal of the field-effect transistor module is connected to the gate of each field-effect transistor. The first access terminal is connected to the anode of the first diode and the cathode of the third diode. The cathode of the first diode is connected to the first terminal of the field-effect transistor module and the cathode of the second diode. The anode of the third diode is connected to the second terminal of the field-effect transistor module and the anode of the fourth diode. The second access terminal is connected to the anode of the second diode and the cathode of the fourth diode. When the low-voltage DC hybrid circuit breaker fails, the main current-carrying branch is disconnected, and n field-effect transistors in the field-effect transistor module conduct to transfer the fault current. When the n field-effect transistors are disconnected, the energy-dissipating branch conducts to clear the fault current. Wherein, n and m are both integers greater than or equal to 1, and n ≤ m. The low-voltage DC hybrid circuit breaker further includes a drive module. The first end of the drive module is connected to the first access terminal, the second end of the drive module is connected to the second access terminal, and the third end of the drive module is connected to the third end of the field-effect transistor module. The drive module is used to drive the field-effect transistor in the field-effect transistor module to conduct when the low-voltage DC hybrid circuit breaker fails. The low-voltage DC hybrid circuit breaker also includes a detection module, the first end of which is connected to the first access end, and the second end of which is connected to the drive module. The detection module is used to detect the magnitude of the fault current. The detection module is also used to determine the number of field-effect transistors turned on in the field-effect transistor module according to the magnitude of the fault current, and to control the driving module to turn on the corresponding number of field-effect transistors in the field-effect transistor module.

2. The low-voltage DC hybrid circuit breaker according to claim 1, characterized in that, The field-effect transistors in the field-effect transistor module are silicon carbide field-effect silicon transistors.

3. The low-voltage DC hybrid circuit breaker according to claim 1, characterized in that, The main current-carrying branch includes a mechanical circuit breaker, the first end of which is connected to the first access terminal, and the second end of which is connected to the second access terminal; the mechanical circuit breaker is used to disconnect the main current-carrying branch when the low-voltage DC hybrid circuit breaker fails.

4. The low-voltage DC hybrid circuit breaker according to claim 1, characterized in that, The energy-consuming branch includes a varistor, with a first end connected to the first access terminal and a second end connected to the second access terminal; the varistor is used to clear the fault current when the low-voltage DC hybrid circuit breaker fails.

5. The low-voltage DC hybrid circuit breaker according to claim 1, characterized in that, The low-voltage DC hybrid circuit breaker also includes a power supply module. The first end of the power supply module is connected to the second end of the drive module, the second end of the power supply module is connected to the second access end, and the third end of the power supply module is connected to the third end of the detection module. The power supply module is used to supply power to the drive module and the detection module.

6. A control method for a low-voltage DC hybrid circuit breaker with adaptive adjustment function, characterized in that, The method, applied to the low-voltage DC hybrid circuit breaker as described in any one of claims 1-5, comprises: When the low-voltage DC hybrid circuit breaker fails, the magnitude of the fault current is obtained; The number of field-effect transistors turned on in the field-effect transistor module is determined based on the magnitude of the fault current, and the corresponding number of field-effect transistors in the field-effect transistor module are controlled to be turned on.

7. A computer device, characterized in that, The device includes a memory and one or more processors, the one or more processors being configured to execute one or more computer programs stored in the memory, wherein, when executing the one or more computer programs, the one or more processors cause the computer device to perform the method of claim 6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, the computer program including program instructions that, when executed by a processor, cause the processor to perform the method as described in claim 6.

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